Study On The Fault Leakage Point And Its Relationship With Oil And Gas Distribution Of Sapugao Oil Layer In Xiaolinke-halahai Area

Xiaolinke-halahai area is located in the middle of Songliao Basin,which is rich in oil and gas.The total amount of oil and gas resources in the area is large,and the remaining amount is large,so the exploration and development prospect is broad.However,there are great differences in the oil and gas of the Sapugao oil layer in the plane and in the vertical direction.This is not only related to the basic factors of hydrocarbon accumulation such as source rock,reservoir and cap rock,but also affected by the leakage point of fault.Therefore,based on the existing regional geological data,geochemical data,seismic data,logging data,testing data and oil testing data in Xiaolinke-halahai area,on the basis of fault development characteristics and oil source fault determination,combined with caprock development and distribution characteristics and sand body distribution characteristics,this paper depicts the vertical and lateral leakage points of faults,and then combined with oil and gas distribution characteristics,the relationship between the fault leakage points and oil and gas distribution are analyzed,which provides a theoretical basis for oil and gas exploration and development in the next stage of Sapugao oil layer in Xiaolinke-halahai area.Based on the above research,the following five aspects of achievements have been obtained:?1?The fault system in Xiaolinke-halahai area is divided into medium-term tension torsion fault system,medium-term tension torsion late inversion fault system and early extension medium-term tension torsion late inversion fault system.?2?In Xiaolinke-halahai area,the vertical leakage points of K₂n^1-2 formation and S₂ oil layers are not developed;the vertical leakage points of S₃ and Putaohua oil layers are developed,mainly distributed in the vast area except Taikang uplift belt;the vertical leakage points of Gaotaizi oil layer are relatively developed,mainly distributed in Xiaolinke fault,Aogula fault and Longhupao anticline structural belt.?3?The lateral leakage points of Saertu oil layer fault in Xiaolinke-halahai area are relatively developed,mainly distributed in Xiaolinke slope break zone,northeast Aogula fault zone,Bayanchagan fault zone and Longhupao anticline structural belt;Putaohua oil layer fault is the most developed,mainly distributed in Bayanchagan fault zone,Talahai fault zone and Longhupao anticline structural belt;in Gaotaizi oil reservoir,the lateral leakage points of the fault are underdeveloped,mainly distributed in the Xiaolinke slope break zone and the northern Aogula fault zone.?4?The reservoir types of Sapugao oil layer in Xiaolinke-halahai area mainly include fault anticline type,fault block type,fault nose type,fault lithology composite type,upward dip pinch out type and fault shielding type.The oil and gas of Sapugao oil layer in Xiaolinke-halahai area is complementary in horizontal distribution and different in vertical distribution.?5?The vertical leakage points of the fault control the distribution of oil and gas over the Sapugao oil layer in the Xiaolinke-halahai area,and the oil and gas wells are mainly distributed within 1.6km away from the vertical leakage point of the fault;the lateral leakage points of the fault control the plane oil and gas distribution position of the Sapugao oil layer in the Xiaolinke-halahai area,and the oil and gas wells are mainly distributed within 2.0km away from the lateral leakage point of the fault.